21=3(a-1)

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Solution for 21=3(a-1) equation: 



21=3(a-1)

We move all terms to the left:

21-(3(a-1))=0



We calculate terms in parentheses: -(3(a-1)), so:

3(a-1)

We multiply parentheses

3a-3

Back to the equation:

-(3a-3)



We get rid of parentheses

-3a+3+21=0

We add all the numbers together, and all the variables

-3a+24=0

We move all terms containing a to the left, all other terms to the right

-3a=-24

a=-24/-3

a=+8

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